What are the disadvantages of reading books?

I agree with experts answer. Thanks for the invitation. 

THE POWER OF READING GLASS INCREASE

The disadvantages in reading relate to the quality of the book; if it has too many negative messages such as propaganda or romanticism of loose morals.

Reading a book may make your eyes feel blurry, and under stress. Your body can get sick from just sitting down and not moving. There are no disadvantage of reading..... You'll spoil the movie. The vast majority of people believe that if it is in a book it must be right and correct.